Comb or saw for cotton burr extractors



Jan. 8, 1935. A. s. MACKENZIE 1,987,240

COMB OR SAW FOR COTTON BURR EXTRACTORS Filed Dec. 14, 1931 gvvumtm 29mm .5? hi e 02.124

Patented Jan. 8, 1935 T77 SAW-FOR 'oo crronrnoaa ":1 f

EXTRACTORSHIJM... n

Alexa der s, Mackenzie, Houston, 'jriex, assi' mr,

COIVIB OR by mesne'as'signments, tof ElkCity Cotton Oil "I 1 Company, a oo'r'poration of Oklahoma ApplicationDeccmber 14, 1931, sit-amt. "581,007. i j

{Teams (01. m ss) h struction of the teeth or the comb. 'Ihese'tee'th 6,778 of 1849, 'Cou-lston 1,346,637 and {Stetefi'sv 1,031,097, and consequently each tooth acts as a carrying means for the burrs and when they come in contact with the stripper, they are either driven onto the-tooth point or torn into such small pieces as to be mixed with the cotton and hence damage the same. 1

Having in mind these objectionable features of the conventional structure, the present invention providesa tooth, wherein it-will be relatively impossible for the burrs to become caught on the teeth points, and wherein they may be easily removed f romthe teeth points, at the same time eliminating a11-= possibility of tearing or shredding or the burrs into the smaller undesirable pieces; Q 1 A further objecitofthe invention is to provide a sawtooth arrangement wherein the space between the respective teeth will be relatively-wide at the entering portion and tapers-"toe throat which-is curved on a radiu's, the center of which isthe adjacent tooth point, whereby the distance.

betweenthe point of'an'y tooth and the nearest part'ofan adjacent'tooth will be as g'r'eator greaterthan 'thedepth of the'too'th. I

By reason of this construction burrs will not wedge in the space between the teeth and if, for any reason, bur-rs should fall intosu'ch portion, they will readily be moved therefrom or rotated out of-the' space "by contact with astripper, for

the opposite direction;

1 Referrin to the drawing, 1 I f.

Figure 1 is a plan view showing m invention applied. 0 J.

slams-15a side elevationshowing the sawtooth arrangement and stripper plate, with burrs to be extracted.

Figure 3 is a detail view of the saw-tooth.

In the drawing, the numeral indicates the usual conveyor in a cotton hulling machine 11 and the rotating extractor having the comb 12 on its periphery constructed in accordance with this invention. It will be understood that a plurality of combs are employed which rotate with the extractor cylinder 11 upon the shaft 13.

In Figure 3, I have shown in detail the conex 'amplegwhich is' either fixed or which travels in will, be indicated as a whole at Hand are prefab ably integrally constructed, although th'ey may be separately formed as desired.

It is to be observed that each tooth hasarela+ tive'ly short side 15 and 'a'long side l6','the two sides extending angular-1y toward" each other to the tooth edge 1'7. The edge 17 'isflattened, as"

shown, and is. relatively narrow, longitudinally terminating in the point 1'8. 1 L. The space between the teethiis wide between the flattened edges 17 :and this distance isi reduced toward the throat.l'9.q

The throat 19. is ourvedtas shown and the iradius of curvature is that attain'edby using the point 18 of the adjacent tooth as; at'center.

" It .will thus be seen that the tooth-hash very wide entering portion defined by thelong'side l6 and the short side 15 ofthe adjacent toot-hwhich merge into the curved-.throat 'l9. 1.? The advantages of :the several: features just described 'willnow be :recited. w I

By employing a tooth having the-flattenedl-edge 1'}, there is eliminated 38,11 possibility, of the cot+ ton burrs being pierced by the point= 1-8,- so' as to become permanently impinged: upon the :tOOU-h point. Such a feature occurs withjthe prior ipatent's referred. to, b'ut with the present-construction this. difliculty-iseffectually overcome; r ,In addition to this feature, moreovermby; the provision of the flattened edge l7-,,-I-,prevent a tearing or such shredding of the burrs'--and r;hu-lls as'will :cause them to: disintegrate in-toysmall pieces. Bylpreventingthis result, there-is no op:- portunity for small and objectionable: iparticles and pieces of the hulls to L;become mixed; with the cottonand-thus-spoil and damage the-samples. I By providing thewide entering space between the teeth merging intopthe; curved throat 19,-;1 produce a toothstructure whereinthe distance betwee'nrthe point of. one toothgandthe-nearest part of the. next adjacent; tooth will-alwaysbeas Q great, if not greater, than the depth of-ytheltooth Theixresult ofthis construction is best: dfimonstrated by reference to Figure 2. Here there is shownthe stripper plate 20 and the comb 12 which is moving past the same. The burr indicated at 21 is about to be struck by the stripper plate, having been carried along by the tooth and it will be noted that the tooth does not pierce the burr or hull and in addition that the stripper plate upon striking the burr will simply rotate it out of position in the space between the teeth, clue to the teeth and throat.

In other words, the teeth of the present invention are of such construction that when a burr is hit by the tooth point, and carried to the stripper 20, it will be easily removable from the point and from the space between the teeth.

There is no opportunity given for the burrs to become wedgedbetween the teeth or to be so pierced by the tooth points as to'become-permanently held thereby. r e

Thus, with the present construction, the burr cannot, become so driven onto the tooth point as to be permanently any reason, a burr be pierced the configuration of the straight edge 17 cooperating with the configuration of the space between the teeth comprising the wide entering portion and -'curved throat will cause said burr to be at once dislodged and rotated out of position upon being struck by the stripper plates The invention may take a variety of forms, all of which are-consideredto be:* comprehended within the appended claims.

i I claim: i

l. A comb for cotton burr extractors comprising spaced teeth, said teeth each having a rela tively short flat portion terminating in a point and the space between therespective teeth defining a throat curved on a radius, of which the tooth point is thecenter, whereby the distance between the point of one tooth and the-nearest, part of a the adjacent tooth :is atleast asgreat as the ing a relatively short flattened portion terminating in a point and the spacebetween the teeth defining a relatively wide entering portion merging with a throat curved on a radius of which the tooth point is the center, said tooth spaces being defined by a relatively longlinclined side and a shorter sideof less inclination", which'sides merge with the curved throat, anda stripper plate positioned adjacent said comb,'said tooth point cooperating with the curved throat to permit a burr thatis carried by the tooth, to rotate about the point and be ejected from the tooth-through the wide entering portion when acteduponby the stripper plate.

3. A combfor cotton burr extractors compris ing spaced teeth, each tooth havingarelative1y short flattened portion terminating in a point and forming a blunt means for engaging 'a cotton boil, the space between the teeth defining a relatively wide entering portion merging witha throat curved on'a'radius of which thetooth point is the center, the distance between the-point of each tooth and the nearest part of the'next adja cent tooth being at of the tooth.

least as great as the depth held thereby, and. should, for,

4. Acomb for cotton burr extractors comprising spaced teeth, each tooth having a relatively short flattened portion terminating in'a point and forming a blunt means for engaging a cotton boll, the space between the teeth defining a relatively wide entering portion merging with a throat curved on a radius of which the tooth point is the center, the distance between the pointoi each tooth and the nearest part of the next adjacent tooth being at least as great as the depth of the tooth, the said blunt engaging portions of the teeth cooperating with a substantially blunt stripper member to prevent permanent penetration and impingement of cotton burrs upon the tooth, and the configuration of the space between the teeth cooperating with saidiblunt means to permit burrs and hulls to be readily rotated out of the space between the respective teeth. I V

5. A saw for usein cotton extracting machines having teeth separated by outwardly-diverging spaces and provided with flat peripheral edges and knife-edge points, the flat edges lying ,in 'planes extending substantially atrightangles vtcgradii of the circledescribed by the saw, and the points or the teeth lying in. said planes, the, width of the space between each two adjacent teeth at the periphery being at least twice'that of the width of each tooth at the periphery, and-one side; of each of said spaces, constitutingthe rear side sofa tooth, being inclined to the vertical-at a greater angle than'the other side and having avlength at least three times the peripheral widthof the tooth.

6; A saw for use'in cotton extracting machines having teeth separated by outwardly diverging spaces and provided with-peripheral edges fiattened longitudinally and transversely, toprovide substantially knife-edge points, the flat edges lying in planes extending substantially at right angles to radii of the circle described bythesaw; and the points of the teeth lying in said planes, the width of the space between each two adjacent teeth at the periphery being at least twice that of the width of each toothtat the periphery, and one side of each of said spaces, constituting the rear side, of a tooth, being inclined to the vertical at a greater angle than the otherj side and having a lengthat least three times the peripheral width of the tooth.-

7. In combination, a comb; for cotton burr ex,- tractors comprising spacedteeth. each tooth hav-' ing a point and the space between the1teeth,de-' fining a relatively wide enteringportion merging with a throat curved on a radiusof whichthe tooth point ,is the center, saidtooth spaces being defined by a relatively longjinclined side and a shorterside of less inclination, which sidesmerge with, the curved throat, and a stripper plate positioned adjacent said comb, said, tooth-point c o,. operating with the curvedthroatito permit a burr that is carried by the tooth, to, rotate about the point and be ejected. fromthetooth through :the

wide enteringportion whencacted upon by the stripper plate. Y ALEXANDER S. MACKENZIE, 

